<template >
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单区 -->
      <el-form
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRefs"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" placeholder prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            placeholder
            prefix-icon="el-icon-lock"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="primary">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定
      loginForm: {
        username: "admin",
        password: "123456"
      },
      //这是登录表单的数据规则验证
      loginFormRules: {
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          { min: 3, max: 15, message: "长度在 3 到 15 个字符", trigger: "blur" }
        ],
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          { min: 3, max: 15, message: "长度在 3 到 15 个字符", trigger: "blur" }
        ]
      }
    };
  },
  methods: {
    login() {
      this.$refs.loginFormRefs.validate(async valid => {
        if (!valid) return;
        // 对象的结构 { data: res }，前面对象data的值赋值给后面的res，如果不用解构函数，则下面2句改成下面
        const res = await this.$http.post("login", this.loginForm);
        if (res.data.meta.status !== 200)
          // const { data: res } = await this.$http.post("login", this.loginForm);
          // if (res.meta.status !== 200) return this.$message.error("登录失败");

          return this.$message.error("登录失败");
        this.$message.success("登录成功");
        console.log(res);
        //1.将登录成功之后的token，保存到客户端的sessionStorage(会话间的存储机制)中
        //  1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //  1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data.data.token);

        //2.通过编程式导航跳转到后台主页，路由地址是  /home
        this.$router.push("/home");
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  border-radius: 3px;
  background-color: white;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar {
  width: 130px;
  height: 130px;
  padding: 10px;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  border-radius: 50%;
  border: 1px solid #eee;
  box-shadow: 0 0 10px #ddd;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  //css3以边框为界限调整边距
  box-sizing: border-box;
}
.btns {
  display: flex; //弹性布局
  justify-content: flex-end;
}
</style>